A New Method to Study the Origin of the EGB and the First Application on AT20G

Details A New Method to Study the Origin of the EGB and the First Application on AT20G A New Method to Study the Origin of the EGB and the First Application on AT20G

2010-12-24

arxiv.org/abs/1012.5358v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

11 pages, 2 figures, 1 table,accepted by ApJL

Scientific paper

In this letter, we introduce a new method of image stacking to directly study the undetected but possible gamma-ray point sources. Applying the method to the Australia Telescope 20 GHz Survey (AT20G) sources which have not been detected by LAT on Fermi, we find that the sources contribute (10.5+/-1.1)% and (4.3+/-0.9)% of the extragalactic gamma-ray background (EGB) and have a very soft spectrum with the photon indexes of 3.09+/-0.23 and 2.61+/-0.26, in the 1-3 and 3-300GeV energy ranges. In the 0.1-1GeV range, they probably contribute more large faction to the EGB, but it is not quite sure. It maybe not appropriate to assume that the undetected sources have the similar property to the detected sources.

Affiliated with

Also associated with

No associations

Rating

A New Method to Study the Origin of the EGB and the First Application on AT20G does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A New Method to Study the Origin of the EGB and the First Application on AT20G, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A New Method to Study the Origin of the EGB and the First Application on AT20G will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-642792